French gold and enamel pocket watch with ratchet key Circa 1830

Gold open faced cylinder watch 
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A fine French, 18K gold and champleve enamel pocket watch with a gold and enamel ratchet key, circa 1830. The bezel is decorated with red and white champlevé enamel half flowers on a black enamel ground, the back covered with polychrome champlevé enamel flowers and foliage and a butterfly on a black enamel ground, outer border to match the bezel. Hinged gold cuvette. Silver dial, engine-turned with radial Roman numerals, outer dot minute divisions. Blued steel Breguet hands. A matte gilt movement, Lepine calibre, jewelled cylinder escapement, plain three arm gilt balance, blued steel flat balance spring, index regulator. Dial and cuvette signed.
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Diameter: 40 mm
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Signed: Le Roy & Fils, Hgers du Roi  Paris
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The case is slightly chipped and the dial is oxidized.